I imagine by now it obvious OP wasn't serious about his claim, anyhow it was worth the chance to negative rate a 2015 old account.
I'm doing kinda the same, I think you should send the friend request first then send the message, i done it like that and it worked for me.
Isn't that a bch address tho?
Well, if the OP accepts the request, i can alway resend the message
That's not a bch address, it's a native segwit address (bech32)
I now realised he blocked you, and well, now me.